Torsional vibration reduction device

Abstract

To provide a vibration reduction device capable of shortening a length in an axial direction.SOLUTION: A torsional vibration reduction device 1 comprises a mass damper 2 that reduces the pulsation of torque by the moment of inertia of an inertia body 4, and an elastic body 22 that is compressed by the relative rotation of an input-side rotary member 9 and an output-side rotary member 18, where spring dampers 3 that reduce the pulsation of torque transmitted between the input-side rotary member 9 and the output-side rotary member 18 by compressing the elastic body 22 are arranged in line in a predetermined axis C direction. The torsional vibration reduction device comprises a bolt 13 that is inserted from the input-side rotary member 9 side and fixes the inertia body 4 and the input-side rotary member 9 in the predetermined axis C direction. The input-side rotary member 9 comprises a housing part 14 that is recessed on the mass damper 2 side so as to house at least a part of a bolt head 13a in a height direction.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] This invention relates to a torsional vibration reduction device that includes a mass damper that reduces torque pulsation by the moment of inertia of an inertial body, and a spring damper that reduces torque pulsation by connecting two plates in the rotational direction via an elastic body. [Background technology]

[0002] Patent Document 1 describes a torsional vibration reduction device that includes a mass damper and a spring damper. In this torsional vibration reduction device, a spring damper is connected to an annular first rotating member that is connected to an engine via a torque limiter, and an annular inertial body that functions as a mass damper is connected to a second rotating member that is a rotating member on the output side of the spring damper. The torque limiter is composed of a plate that rotates integrally with the first rotating member, an intermediate member that is in frictional contact with one side of the plate, a disc spring that presses the plate toward the intermediate member, and an annular plate that is arranged on the opposite side of the plate across the disc spring and is bolted to the first rotating member. In addition, the first rotating member and the second rotating member are arranged side by side in the axial direction, and an inertial body is bolted to one of the side surfaces of the second rotating member that faces the opposite side to the first rotating member.

[0003] Patent Documents 2 to 4 disclose a vibration reduction device that includes a flexible plate connected to an engine, a ring member abutting against a side surface of the flexible plate, a hub flange that rotates integrally with the output shaft, a damping section that elastically connects the ring member and the hub flange in the circumferential direction and damps torsional vibration between the two members, and an inertia member integrated with the hub flange. The flexible plate, the damping section, and the inertia member are arranged side by side in the axial direction, and an inertia member formed in an arc shape is fixed by a rivet to one of the sides of the flexible plate facing the opposite side to the damping section. The flexible plate and the ring member are fixed by a bolt inserted from the flexible plate side, and the inertia member has a notch corresponding to the bolt head. The inertia member integrated with the hub flange described in Patent Document 3 is configured to function as an input member of a clutch mechanism. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2009-292477 A [Patent Document 2] Japanese Patent Application Publication No. 7-224892 [Patent Document 3] Japanese Patent Application Publication No. 7-224896 [Patent Document 4] Japanese Patent Application Publication No. 7-224897 Summary of the Invention [Problem to be solved by the invention]

[0005] The vibration reduction device described in Patent Document 1 has a first rotating member, a spring damper, and an inertial body arranged in this order along the rotation center axis. The second rotating member, which is the rotating member on the output side of the spring damper, and the inertial body are fixed by a bolt inserted from the inertial body side, and the bolt head protrudes from the inertial body. In other words, the axial length of the vibration reduction device depends on the thickness of the first rotating member, the spring damper, and the inertial body, and the amount of protrusion of the bolt head, and there is room for improvement in order to shorten the axial length.

[0006] Furthermore, the axial length of the vibration reduction devices described in Patent Documents 2 to 4 depends on the thickness of the inertia member integrated with the inertia body, flexible plate, damping section, and hub flange. In other words, by providing an inertia body to increase the moment of inertia on the input side of the damping section, the axial length of the vibration reduction device becomes long, and there is room for improvement in order to shorten the axial length of the vibration reduction device.

[0007] The present invention has been made in consideration of the above technical problems, and has an object to provide a vibration reduction device capable of shortening its axial length. [Means for solving the problem]

[0008] In order to achieve the above object, the present invention provides a torsional vibration reduction device in which a mass damper that reduces torque pulsation due to the moment of inertia of an inertial body, and a spring damper that includes an elastic body that is compressed when an input side rotating member and an output side rotating member rotate relative to each other and reduces torque pulsation transmitted between the input side rotating member and the output side rotating member as a result of the elastic body being compressed, are arranged side by side in a predetermined axial direction. It is a place a bolt that is inserted from the input side rotating member side and fixes the inertia body and the input side rotating member in the predetermined axial direction, and the input side rotating member has an accommodating portion that is recessed on the mass damper side so as to accommodate at least a part of the height direction of the head of the bolt. the torque limiter further includes a torque limiter that limits a torque transmitted between the mass damper and the spring damper, the torque limiter includes two plates that are stacked and integrated in the predetermined axial direction, the two plates are stacked on the mass damper in the predetermined axial direction, the input side rotating member includes an outer plate that is stacked on the opposite side to the mass damper with an inner plate in contact with the mass damper between them, and the accommodating portion includes a through hole that penetrates the outer plate. The present invention is characterized by the following:

[0009] In the present invention, the depth of the accommodating portion may be formed to be equal to or less than the height of the head of the bolt.

[0010] In addition, in the present invention, the end of the spring damper may be positioned closer to the mass damper than the tip of the bolt head in the specified axial direction, and the end of the spring damper may be positioned closer to the mass damper than the end of the accommodating portion in the specified axial direction.

[0012] In the present invention, the input side rotation member may be formed so that a portion having the accommodation portion has a thickness greater than a thickness of other portions.

[0013] In this invention, the input side rotating member includes a driving side rotating member that transmits torque to the spring damper, and an inertia member integrated with the driving side rotating member in the specified axial direction, and the accommodating portion may be formed in the inertia member. Effect of the Invention

[0014] According to this invention, the mass damper and the spring damper are arranged side by side in a predetermined axial direction, and a bolt is inserted into the spring damper from the input side rotating member side to fix the inertial body and the input side rotating member. Therefore, it is possible to prevent the bolt head from protruding toward the inertial body. In other words, it is possible to prevent the axial length of the torsional vibration reduction device from increasing due to the bolt head protruding from the inertial body. Also, the input side rotating member is formed with a recessed accommodation portion on the mass damper side so as to accommodate at least a part of the bolt head. Therefore, it is possible to reduce the amount of protrusion of the bolt head from the input side rotating member, and it is possible to prevent the axial length of the torsional vibration reduction device from increasing. [Brief description of the drawings]

[0015] [Figure 1] 1 is a front view of a torsional vibration reduction device according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a cross-sectional view taken along line II in FIG. [Diagram 3] FIG. 3 is an enlarged view of part III in FIG. [Figure 4] 13 is a cross-sectional view showing an example in which a through hole into which a bolt head is inserted is formed in a cover plate. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] FIG. 1 shows a front view for explaining an example of a vibration reduction device in an embodiment of the present invention, FIG. 2 shows a cross-sectional view along line II-II in FIG. 1, and FIG. 3 shows an enlarged view of part III in FIG. 2.

[0017] 1 and 2, the vibration reduction device 1 is composed of a mass damper 2 that reduces torque pulsation (torsional vibration) by the moment of inertia of an inertial body, and a spring damper 3 that reduces torque pulsation (torsional vibration) by compressing an elastic body. The mass damper 2 and spring damper 3 are arranged side by side in the direction of the rotational center axis C of a crankshaft 5, which will be described later.

[0018] 2, the mass damper 2 is configured by a flywheel 4 formed in an annular shape. In other words, the flywheel 4 functions as an inertial body.

[0019] The crankshaft 5 of an engine (not shown) abuts against the inner peripheral side of the flywheel 4, and the crankshaft 5 and the flywheel 4 are integrated by bolts 6 inserted from the opposite side of the engine. The thickness of the outer peripheral part of the flywheel 4 is made thicker than the thickness of the inner peripheral part so that it protrudes to the opposite side of the engine. By making the outer peripheral part of the flywheel 4 thicker in this way, the mass of the flywheel 4 increases and the moment of inertia of the flywheel 4 increases. In other words, the torsional vibration reduction effect of the mass damper 2 can be improved.

[0020] The flywheel 4 is provided with a torque limiter 7 for limiting the torque transmitted between the flywheel 4 and the spring damper 3. This torque limiter 7 can be configured in the same manner as a conventional torque limiter, and is configured with a friction engagement mechanism that limits the torque transmitted by the relative rotation of an input side rotating member and an output side rotating member when a torque equal to or greater than a predetermined torque acts.

[0021] 2 and 3, the torque limiter 7 is composed of a support plate 8 and a cover plate 9 integrated with the flywheel 4, a pressure plate 10 arranged opposite the cover plate 9, a disc spring 11 that presses the pressure plate 10 toward the cover plate 9, and a drive-side rotating member 12 arranged between the pressure plate 10 and the cover plate 9. The support plate 8 and cover plate 9 correspond to the "two plates" in this embodiment of the present invention, and the cover plate 9 corresponds to the "outer plate" in this embodiment of the present invention.

[0022] The support plate 8 is formed by pressing or the like, with its outer peripheral side surface in contact with the outer peripheral end face of the flywheel 4, and the portion on the inner peripheral side of the portion in contact with the flywheel 4 being bent toward the flywheel 4. In other words, the support plate 8 is bent so that the edge on the inner peripheral side of the support plate 8 is located inside the outer periphery of the flywheel 4.

[0023] The cover plate 9 corresponds to the “input side rotating member” in the embodiment of the present invention, and is provided on the opposite side of the support plate 8 from the flywheel 4. That is, the cover plate 9 and the support plate 8 are arranged in a stacked manner in the direction of the rotational center axis C of the crankshaft 5, and the cover plate 9 and the support plate 8 are arranged in a stacked manner on the flywheel 4 that functions as the mass damper 2.

[0024] The cover plate 9 can be formed by pressing in the same manner as the support plate 8, and the thickness of the outer periphery side is formed thicker than the thickness of the inner periphery side. Specifically, the side opposite to the flywheel 4 is formed as a smooth surface, and the outer periphery side of the side facing the flywheel 4 is formed thicker so that the outer periphery side of the cover plate 9 protrudes more toward the flywheel 4 than the inner periphery side. In other words, the outer periphery curves toward the flywheel 4, and due to this curvature, the outer periphery is recessed toward the flywheel 4 more than the inner periphery side, and a thick portion that has an increased thickness while accommodating the bolt head 13a is formed in the recessed portion. The inner diameter of the cover plate 9 is formed smaller than the inner diameter of the support plate 8.

[0025] The outer peripheral portion is fixed to the flywheel 4 by bolts 13 from the cover plate 9 side. A recess 14 is formed on the outer peripheral portion of the cover plate 9 to accommodate at least a part of the bolt head 13a, as shown in FIG. 3. That is, the opening diameter of the recess 14 is larger than the diameter of the bolt head 13a. In other words, the plate thickness other than the recess 14 that accommodates the bolt head 13a is made thicker according to the height of the bolt head 13a. The depth of the recess 14 is preferably equal to or greater than the height of the bolt head 13a, but it is sufficient if at least a part of the bolt head 13a can be accommodated therein, as shown in FIG. 3. The recess 14 corresponds to the "accommodating portion" in the embodiment of the present invention.

[0026] As shown in FIG. 1, the support plate 8 and the cover plate 9 are fixed by rivets 15 at a predetermined interval in the circumferential direction, and through holes 16 that pass through the cover plate 9, the support plate 8, and the flywheel 4 are formed at a predetermined interval in the circumferential direction in order to inspect the engine before shipment.

[0027] As described above, the inner peripheral portion of the support plate 8 is bent toward the flywheel 4, and the outer peripheral portion of the cover plate 9 is formed thick so as to protrude toward the flywheel 4. In other words, the outer peripheral portion of the side surface of the cover plate 9 facing the support plate 8 is curved toward the support plate 8. Therefore, the inner peripheral portions of the support plate 8 and the cover plate 9 are spaced apart in the direction of the central axis C of rotation.

[0028] A pressure plate 10 is disposed facing the inner peripheral side surface of the cover plate 9, and a disc spring 11 is disposed between the support plate 8 and the pressure plate 10 so as to press the pressure plate 10. That is, the disc spring 11 presses the pressure plate 10 toward the cover plate 9. A driving side rotating member 12 for transmitting torque to the spring damper 3 is sandwiched between the pressure plate 10 and the cover plate 9. Friction materials 17 for improving frictional force with the pressure plate 10 and the cover plate 9 are attached to both side surfaces of the driving side rotating member 12.

[0029] Therefore, by pressing the pressure plate 10 with the disc spring 11, the driving side rotating member 12 is clamped between the pressure plate 10 and the cover plate 9, and a frictional force is generated according to the clamping pressure and the friction coefficient between the pressure plate 10 or cover plate 9 and the driving side rotating member 12 (specifically, the friction material 17), and torque is transmitted between the cover plate 9 and the driving side rotating member 12 up to an upper limit of the torque based on that frictional force.

[0030] A spring damper 3 is connected to the driving side rotating member 12. This spring damper 3 is configured to damp and output the pulsation (torsional vibration) of the input torque, similar to a conventional spring damper. The spring damper 3 shown in Fig. 2 includes the driving side rotating member 12 and a driven side rotating member 18 that is provided concentrically with the driving side rotating member 12 and capable of relative rotation.

[0031] A pair of annular drive plates 19 are connected to both side surfaces of the driving side rotating member 12 by rivets 20. A window hole 21 having a predetermined length in the circumferential direction is formed in the drive plate 19, and a coil spring 22 arranged to be expandable and contractible in the circumferential direction is housed in the window hole 21. The coil spring 22 corresponds to the "elastic body" in the embodiment of the present invention. The pair of drive plates 19 are formed so as to be separated from each other from the outer periphery toward the window hole 21, and the edges on the window hole 21 side are separated from each other by a distance substantially equal to the outer diameter of the coil spring 22.

[0032] The driven-side rotating member 18 is composed of a hollow shaft 24 spline-engaged with a transmission shaft 23, which is an output member of the torsional vibration reducing device 1, and a flange 25 protruding outward from the outer circumferential surface of the hollow shaft 24 toward the annular gap formed between the pair of drive plates 19. The flange 25 is configured to compress the coil spring 22 between itself and the circumferential wall surface of the window hole 21 when the drive-side rotating member 12 and the driven-side rotating member 18 rotate relatively.

[0033] Therefore, the coil spring 22 is compressed by the relative rotation of the driving side rotating member 12 and the driven side rotating member 18, and is configured to absorb and attenuate the pulsation of the torque transmitted between the driving side rotating member 12 and the driven side rotating member 18 according to the amount of compression. A friction engagement device 26 that transmits torque by stacking and pressing a plurality of plates and friction materials is provided in the gap between the inner periphery of the pair of drive plates 19 and the inner periphery of the flange portion 25 in the direction of the rotation center axis C.

[0034] As described above, by inserting the bolt 13 from the spring damper 3 side to fix the cover plate 9 and the flywheel 4, it is possible to prevent the bolt head 13a from protruding toward the flywheel 4. That is, it is possible to prevent the length of the torsional vibration reduction device 1 in the direction of the rotation center axis C from being increased due to the bolt head 13a protruding from the flywheel 4. In addition, by forming the recess 14 for accommodating the bolt head 13a in the cover plate 9, it is possible to reduce the protrusion amount of the bolt head 13a. More specifically, as shown in FIG. 2, the member that protrudes most toward the output side (the right side in FIG. 2) in the direction of the rotation center axis C of the torsional vibration reduction device 1 is the drive plate 19 or the coil spring 22, and it is possible to prevent the bolt head 13a from protruding in the direction of the rotation center axis C beyond the drive plate 19 or the coil spring 22. In other words, by forming the recess 14 for accommodating the bolt head 13a, it is possible to form the cover plate 9 with a large plate thickness. This cover plate 9 rotates integrally with the flywheel 4 and functions as an inertial body of the mass damper 2. Therefore, by making the cover plate 9 thick, the mass of the inertial body can be increased, thereby improving the moment of inertia. Furthermore, since the mass of the outer periphery of the cover plate 9 can be increased, the vibration reduction effect relative to the increase in mass can be further improved.

[0035] It is to be noted that the cover plate 9 is not limited to being thicker on the outer periphery than on the inner periphery as described above. The cover plate 9 may be formed to a constant thickness, with its outer periphery being bent toward the flywheel 4, and another plate serving as an inertia member may be integrated onto the side of the outer periphery by welding, bonding or riveting, thereby providing an additional inertia body having a recess for accommodating the bolt head 13a.

[0036] 2, the cover plate 9 and the support plate 8 are integrated with a rivet 15. This is to make it possible to assemble the torque limiter 7 and the spring damper 3 as a unit and then assemble the unitized torque limiter 7 and the spring damper 3 to the flywheel 4. Therefore, only the support plate 8 may be fixed to the flywheel 4 with a bolt. Specifically, as shown in FIG. 4, a through hole 27 larger than the outer diameter of the bolt head 13a may be formed in the cover plate 9, and the support plate 8 may be fixed to the flywheel 4 so that the bolt head 13a and the side surface of the support plate 8 come into contact with each other.

[0037] By forming the through hole 27 in the cover plate 9 in this manner, the amount of protrusion of the bolt head 13a can be reduced, and the plate thickness of the flywheel 4 can be increased accordingly. This improves the vibration reduction effect of the mass damper 2 while preventing the length of the torsional vibration reduction device 1 in the direction of the rotational center axis C from increasing.

[0038] Note that the accommodating portion in the embodiment of the present invention only needs to be configured to be able to accommodate at least a portion of bolt head 13a, and the depth of the accommodating portion may be determined with the height of bolt head 13a as its upper limit. By determining the depth of the accommodating portion with the height of bolt head 13a as its upper limit in this manner, it is possible to suppress interference with a member that is arranged alongside the outer periphery of torsional vibration reduction device 1 in the axial direction, such as a countershaft that is provided in parallel with transmission shaft 23 and a gear attached to the countershaft, and therefore it is possible to shorten the axial length of the entire apparatus including torsional vibration reduction device 1.

[0039] The depth of the accommodation portion may be deeper than the height of the bolt head 13a. That is, it is sufficient that the position of the open end of the accommodation portion is recessed from the end of the member that protrudes most in the direction of the rotation center axis C of the torsional vibration reduction device 1. Specifically, when the spring damper 3 protrudes most in the direction of the rotation center axis C as shown in Fig. 2, the thickness of the cover plate 9 may be increased up to the end of the member that constitutes the spring damper 3 in the direction of the rotation center axis C of the torsional vibration reduction device 1, and an accommodation portion such as a recess 14 may be formed in the cover plate 9.

[0040] Furthermore, in the case where the bolt head 13a protrudes most in the direction of the rotation center axis C of the torsional vibration reduction device 1, the thickness of the cover plate 9 may be increased up to the end of the bolt head 13a, and a housing portion such as the recess 14 may be formed in the cover plate 9. In other words, in the case where the end of the spring damper 3 is located closer to the mass damper 2 than the tip of the bolt head 13a in the direction of the rotation center axis C of the torsional vibration reduction device 1, the end of the spring damper 3 may be configured to be located closer to the mass damper 2 than the end of the recess 14.

[0041] Furthermore, the thickness of the outer circumferential side of the cover plate 9 may be uniformly thick in the circumferential direction, or may be partially thick. Alternatively, when another plate serving as an inertia member is integrated with the cover plate 9 by welding, bonding, riveting, or the like as described above, a plurality of plates may be attached to the cover plate 9, for example, three arc-shaped plates may be attached in line in the circumferential direction.

[0042] The torsional vibration reduction device in the embodiment of the present invention does not have to include a torque limiter between the mass damper and the spring damper. In the case of a torsional vibration reduction device that does not include a torque limiter, the driving side rotating member 12, which is the input side rotating member of the spring damper, is fixed to the mass damper with bolts, and an accommodation portion such as a recess for accommodating the bolt head may be formed in the plate. [Explanation of symbols]

[0043] 1 Torsional vibration reduction device 2 Mass damper 3 Spring Damper 4 Flywheel 6,13 Volts 7 Torque limiter 8 Support Plate 9 Cover Plate 12 Drive side rotating member 13a Bolt head 14 Recess 16,27 Through hole 18 Driven side rotating member 22 Coil spring C Rotational axis

Claims

1. A torsional vibration reduction device in which a mass damper that reduces torque pulsation due to the moment of inertia of an inertial body and a spring damper that includes an elastic body that is compressed when an input side rotating member and an output side rotating member rotate relative to each other, and that reduces torque pulsation transmitted between the input side rotating member and the output side rotating member as a result of the elastic body being compressed, are arranged side by side in a predetermined axial direction, a bolt that is inserted from the input side rotation member side to fix the inertia body and the input side rotation member in the predetermined axial direction, the input side rotation member includes an accommodating portion recessed toward the mass damper so as to accommodate at least a portion of the head of the bolt in a height direction, a torque limiter that limits a torque transmitted between the mass damper and the spring damper; The torque limiter includes two plates that are stacked and integrated in the predetermined axial direction, The two plates are stacked on the mass damper in the predetermined axial direction, the input side rotation member includes an outer plate stacked on an opposite side to the mass damper with an inner plate in contact with the mass damper being sandwiched therebetween, The housing portion includes a through hole passing through the outer plate. A torsional vibration reduction device characterized by the above.

2. 2. The torsional vibration reduction device according to claim 1, The depth of the receiving portion is formed to be equal to or less than the height of the head of the bolt. A torsional vibration reduction device characterized by the above.

3. 2. The torsional vibration reduction device according to claim 1, an end of the spring damper is located closer to the mass damper than a tip of the bolt head in the predetermined axial direction, an end of the spring damper is positioned closer to the mass damper than an end of the accommodation portion in the direction of the predetermined axis; It is configured as follows: A torsional vibration reduction device characterized by the above.

4. The torsional vibration reduction device according to any one of claims 1 to 3, The input side rotating member is formed so that the plate thickness of the portion having the accommodation portion is greater than the plate thickness of the other portions. A torsional vibration reduction device characterized by the above.

5. The torsional vibration reduction device according to any one of claims 1 to 3, the input side rotating member includes a driving side rotating member that transmits torque to the spring damper, and an inertia member that is integrated with the driving side rotating member in the predetermined axial direction, The housing portion is formed in the inertia member. A torsional vibration reduction device characterized by the above.

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